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The Encyclopedia of Horology

Wristwatch · Split seconds chronograph

Patek Philippe Split Seconds Chronograph 5370P

Partially verified

The Patek Philippe reference 5370P is a platinum-cased split-seconds chronograph wristwatch featuring a blue Grand Feu enamel dial. Introduced in 2015, this model marks the brand's first fully in-house developed split-seconds chronograph movement, identified as the caliber CHR 29-535 PS. The mechanical architecture incorporates six patented technical innovations intended to optimize gear engagement and balance amplitude. The timepiece was developed under the oversight of Thierry Stern, with engineering led by Philip Barat and aesthetic design managed by Sandrine Stern. The case back is transparent, exposing the hand-finished movement components. The exact dimensions of the platinum case are not provided in the documentation, and there is no information regarding original accompanying accessories.

Front view of the Patek Philippe 5370P wristwatch showing the blue Grand Feu enamel dial and platinum case.
Front view of the Patek Philippe 5370P wristwatch showing the blue Grand Feu enamel dial and platinum case. — Zamanito. Rights pending — permission not yet requested. Original source

Catalogue identity

Source
zamanito.com
Category
Wristwatch · Split seconds chronograph
Maker / attribution
Patek Philippe
Reference
5370P
Catalogue / lot identifier
Source URL identifies the listing
Source-reported date
2015
Source-reported place
Switzerland

Source-reported attribution and specifications are not independent authentication. A listing does not establish present ownership, current display, availability or permission to reproduce.

Object description

Case and Dial

The reference 5370P features a case constructed from platinum, consistent with the brand's naming convention for this metal. The dial is executed in blue Grand Feu enamel, characterized by applied numerals and sub-dials. The arrangement includes two main sub-dials for the chronograph functions.

The case design includes a three-button configuration to manage the split-seconds chronograph complications. The dial layout includes a tachymeter scale printed on the outer periphery. The visual presentation of the case and dial is described as classical in nature.

Evidence for this section
  • “قابی از جنس پلاتین”
  • “صفحه‌ای با مینای آبی گرند فو (Grand Feu enamel)”
  • “نخستین کرنوگراف اسپلیت سکندز (تک‌ثانیه‌ای یا رتروپانت) سه‌دکمه‌ای”

Movement and Engineering

The movement powering the 5370P is the hand-wound caliber CHR 29-535 PS, which is an in-house development. This engine includes a re-engineered split-seconds mechanism, which is intended to provide smoother gear engagement and increased stability of balance amplitude compared to predecessor movements.

The movement construction incorporates six distinct patented technical innovations specifically for the chronograph system. The manual finishing of the movement is visible through the exhibition case back, allowing observation of the complex mechanical parts.

Evidence for this section
  • “مجهز به کالیبر دست‌ساز CHR 29-535 PS”
  • “شش نوآوری فنی ثبت اختراع شده را در ساختار کرنوگراف به همراه دارد”
  • “پشت قاب شفاف امکان مشاهده پرداخت‌های دست‌ساز و اجزای پیچیده این کالیبر فاخر را فراهم می‌سازد”

Development and Attribution

The development of the 5370P was a structured project within Patek Philippe, involving key leadership. Thierry Stern oversaw the initiative, while Philip Barat directed the engineering and technical development of the caliber. Sandrine Stern was responsible for the aesthetic design of the watch.

The watch is presented as an example of contemporary complications produced in Geneva. No specific provenance or historical ownership data is available in the provided source.

Evidence for this section
  • “ایده اولیه آن تحت نظر تیری استرن (Thierry Stern) شکل گرفت”
  • “توسعه فنی و مهندسی موتور تحت هدایت فیلیپ بارات (Philip Barat) انجام شد”
  • “طراحی ظاهری آن نیز توسط ساندرین استرن (Sandrine Stern) نظارت گردید”

Open research questions

  • What are the exact case diameter and thickness dimensions for this reference?
  • Are there variations in the enamel dial color or material finishes produced under this reference number?

Source evidence

Recorded claims and source quotations for Patek Philippe Split Seconds Chronograph 5370P
FieldSource-reported valueSource quotation
MakerPatek Philippe“پاتک فیلیپ (Patek Philippe)”
MovementCHR 29-535 PS“کالیبر دست‌ساز CHR 29-535 PS”
Case materialPlatinum“قابی از جنس پلاتین”
DialGrand Feu Enamel“صفحه‌ای با مینای آبی گرند فو (Grand Feu enamel)”
Introduction year2015“برای نخستین بار در سال ۲۰۱۵ معرفی شد”
Movement typeIn-house“نخستین کرنوگراف اسپلیت سکندز (تک‌ثانیه‌ای یا رتروپانت) سه‌دکمه‌ای کاملاً ساخت درون‌خانه‌ای (In-House) این کارگاه”
Technical patents6“شش نوآوری فنی ثبت اختراع شده”

Visible details

  • Blue Grand Feu enamel dial with applied Arabic numerals
  • Exposed chronograph movement components through a transparent case back
  • Three-button chronograph pusher configuration

Research qualifications

  • Service history and functional status are not recorded
  • Original packaging, documentation, or accompanying accessories are not verified

Photograph identity and source facts were screened before import; rights clearance remains pending.

Consulted source

ساعت مچی پاتک فیلیپ Patek Philippe رفرنس 5370P کرنوگراف اسپلیت سکندز پلاتین

Reviewed 2026-11-02 · Record 783daeb78d

Terms in this record

Glossary explanations for terms named in this object’s record.

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